I just checked and both PragerU and DonutOperator still exist on YouTube. If they have ever had anti propaganda rules, I can’t think of a time I’ve ever seen them enforced.
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That is a REALLY good point, it looks to me like a lot of the most popular and/or sophisticated far right propaganda outlets also function as cash grabs.
But to your original question, yes, I recognize DonutOperator as propaganda. He has platformed extremist right wing politicians in the past, and the main function of his platform is to normalize police violence. (Edit: I forgot that his platform has grown. The main function of the YouTube channel under that name is to normalize police violence, a lot of what seems to have grown around that is the cash grab stuff)